KR101002311B1 - Back light unit of liquid crystal display device - Google Patents

Abstract

The present invention is to provide a backlight unit of a liquid crystal display device which is suitable for effectively preventing the light scattering means and the intermediate light guide plate sagging and the problem of deterioration of image quality. A plurality of lamp array units in which one lamp is arranged in one direction; Light scattering means disposed above the lamp array; An intermediate light guide plate disposed between the lamp and the light scattering means; A plurality of reflectors disposed below the intermediate light guide plate so as to correspond to each of the lamps; A first supporter configured to support the intermediate light guide plate from below; And a second support coupled to the first support and configured to simultaneously support the light scattering means and the intermediate light guide plate.

Support, medium light guide plate, LED

Description

BACK LIGHT UNIT OF LIQUID CRYSTAL DISPLAY DEVICE}

1 is a structural diagram showing a general backlight unit

2 is a perspective view showing a backlight unit according to the prior art

3 is a plan view showing a backlight unit according to another conventional technology

4A and 4B are structural cross-sectional views of the backlight unit taken along lines II ′ and II-II ′ of FIG. 3.

5 is a plan view illustrating a backlight unit according to an exemplary embodiment of the present invention.

6A and 6B are structural cross-sectional views of the backlight unit taken along line III-III ′ and IV-IV ′ of FIG. 5.

7 and 8 are cross-sectional views showing a coupling structure of the first and second supports according to an embodiment of the present invention for preventing sagging of the intermediate light guide plate in the up and down directions.

FIG. 9 is a diagram illustrating a problem caused by deflection when the intermediate light guide plate is configured as one support having a two-stage structure.

Explanation of symbols on the main parts of the drawings

50: lamp array unit 51: LED lamp

52: intermediate light guide plate 53: reflector                 

54a: 1st support 54b: 2nd support

55 light scattering means 60

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device (LCD), and more particularly, to a backlight unit of a liquid crystal display device suitable for preventing up and down sagging of an intermediate light guide plate.

CRT (Cathode Ray Tube), one of the commonly used display devices, is mainly used for monitors such as TVs, measuring devices, information terminal devices, etc., but the miniaturization of electronic products due to the weight and size of CRT itself It was unable to actively respond to the demand for weight reduction.

Therefore, in the trend of miniaturization and light weight of various electronic products, CRT has a certain limit in weight and size, and is expected to be replaced. Liquid crystal display (LCD) and gas discharge using electro-optic effects Plasma Display Panel (PDP) and Electro Luminescence Display (ELD) using the electroluminescent effect, among others, are being actively studied for the liquid crystal display device.

In order to replace the CRT, a liquid crystal display device having advantages such as small size, light weight, and low power consumption has recently been developed to a sufficient extent to perform a role as a flat panel display device, and not only a monitor of a laptop computer but also a desktop computer. The demand for liquid crystal display devices continues to increase as they are used in monitors and large information display devices.

The liquid crystal display may be classified into a liquid crystal panel displaying an image and a driving unit for applying a driving signal to the liquid crystal panel. The liquid crystal panel may include first and second glass substrates bonded to each other with a predetermined space, and It consists of the liquid crystal layer injected between the 1st, 2nd glass substrate.

The first glass substrate (TFT array substrate) may include a plurality of gate lines arranged in one direction at a predetermined interval, a plurality of data lines arranged at regular intervals in a direction perpendicular to the gate lines, A plurality of pixel electrodes formed in a matrix form in each pixel region defined by crossing a gate line and a data line, and a plurality of thin films which are switched by signals of the gate line to transfer the signal of the data line to each pixel electrode Transistors are formed.

The second glass substrate (color filter substrate) includes a black matrix layer for blocking light in portions other than the pixel region, an R, G and B color filter layer for expressing color colors, and a common electrode for implementing an image. Is formed.

The first and second glass substrates are bonded to each other by a seal material having a predetermined space by a spacer and having a liquid crystal injection hole, so that the liquid crystal is injected between the two substrates.

On the other hand, since most of the liquid crystal display devices are light-receiving elements that display an image by controlling the amount of light source coming from the outside, a separate light source, that is, a back light, for irradiating light to the liquid crystal panel is absolutely necessary. Is divided into edge type and direct type according to the location where the lamp unit is installed.

The light source includes EL (Electro Luminescence), LED (Light Emitting Diode), CCFL (Cold Cathode Fluorescent Lamp), HCFL (Hot Cathode Fluorescent Lamp), etc., especially long life, low power consumption and thin can be formed. CCFL is widely used in large color TFT LCDs.

The CCFL method uses a fluorescent discharge tube in which mercury gas containing argon, neon, or the like is sealed at a low pressure in order to use a penning effect. Electrodes are formed at both ends of the tube, and the cathode is formed in a wide plate shape.When voltage is applied, as in the sputtering phenomenon, charged particles in the discharge tube collide with the plate-shaped cathode to generate secondary electrons, which excite surrounding elements to excite the plasma. To form.

These elements emit strong ultraviolet light, which in turn excites the phosphor, causing the phosphor to emit visible light.

In the double-edge method, the lamp unit is installed on the side of the light guide plate for guiding the light, and the lamp unit covers a lamp emitting light, a lamp holder inserted at both ends of the lamp to protect the lamp, and an outer circumferential surface of the lamp, and one side It is provided with a lamp reflector plate fitted to the side of the light guide plate to reflect the light emitted from the lamp toward the light guide plate.

The edge method in which the lamp unit is installed on the side of the light guide plate is applied to a relatively small liquid crystal display device such as a monitor of a laptop computer and a desktop computer, and has good uniformity of light and a long service life. It is advantageous to thin the liquid crystal display device.

On the other hand, the direct method began to be developed mainly as the size of the liquid crystal display device became larger than 20 inches. will be.

The direct method is mainly used for a large screen liquid crystal display device requiring high luminance because the light utilization efficiency is higher than that of the edge method.

However, the liquid crystal display device adopting the direct method is used as a large monitor or a television, which takes longer to use than a laptop computer, and because the number of lamps is larger, the failure and life of the lamp in the direct method than the edge method. It is more likely that a lamp that will not turn on appears.

In the direct method, because a plurality of lamps are installed on the bottom of the screen, for example, due to the life and failure of the lamp, if one lamp does not light up, the part where the lamp does not light up becomes significantly darker than the other part. The part will appear immediately on the screen.

For this reason, since the lamp is frequently replaced in the direct method, the lamp unit should be easily disassembled and assembled.

As described above, the liquid crystal display device uses a liquid crystal to control the amount of light transmitted through the screen, and uses the light to determine the contrast and the color of the screen.                         

For example, the viewing angle of which the image quality varies greatly depending on the angle of view of the screen, the transmittance according to the projection light emitting display, and the transmitted light pass through the color filter to display the colors of red (R), green (G), and blue (B). These include color reproducibility depending on how much they are reproduced, luminance representing the contrast of the image, and afterimages in which the traces of the image remain long when the same image is continued for a long time.

Currently, liquid crystal displays are expanding from display of portable products to monitors for desktop PCs and home TVs. Although the liquid crystal display has the physical advantages of light and thin, the color reproducibility and luminance, among the above characteristics, are particularly weak compared to the CRT.

Conventional LCD monitors have 40-50% color reproducibility compared to the NTSC system adopted by the National Television System Committee for color television broadcasting. Could meet.

However, in the case of a TV which is attracting attention as a market for a new liquid crystal display device, it is required to develop a liquid crystal display device capable of realizing color reproducibility of CRT level or higher.

A typical multi-color liquid crystal display device is largely composed of a liquid crystal panel, a backlight, and a color filter. That is, by using a backlight composed of a three-wavelength fluorescent lamp as a light source, the white light emitted from the color filter is separated into three colors of red, green, and blue in the color filter, and then added and mixed again to realize various colors.

The color of the light source is determined by chromaticitycordinates as determined by the International Lighting Commission. That is, after calculating tristimulus values X, Y and Z from the spectra of an arbitrary light source, color coordinates x, y and z of red, green and blue are obtained from the tristimulus values using the transformation matrix. Subsequently, when the x, y values of red, green, and blue are expressed in Cartesian coordinates, a horn-shaped spectral trajectory is drawn, which is called a CIE chromaticity diagram. All common light sources have their color coordinates inside these horseshoe shapes.

In this case, a triangular region formed by each color coordinate of red, green, and blue becomes a color reproduction region, and as the triangle region becomes larger, color reproducibility is increased. Color reproducibility depends on color purity and luminance, and color reproducibility increases as color purity and luminance increase.

Here, the tristimulus values X, Y, and Z represent weights of individual color-matching functions close to a spectrum, and particularly Y represents a stimulus value for brightness.

On the other hand, the color temperature of the white color based on the color change of the light emitted according to the temperature of the heat source is called the color temperature, the color temperature on the monitor is represented by three, that is, 9300K, 6500K and 5000K.

The closer the color temperature is to 9000K, the more white is added to the blue color. If the color temperature is 6500K, the red color is added to the white. If the color temperature is 5000K, the color becomes neutral. The color temperature is obtained from the color coordinates (x, y) of white. As the color temperature is around 9000K, the European broadcasting union (EBU) standard can be satisfied.

In the case of the liquid crystal display described above, the emission spectrum of the backlight is combined with the transmission spectrum of the isochromatic function and the color filter to determine tristimulus values for each wavelength of the visible light region. Correlation between extremes should be adjusted accordingly. That is, in order to optimize color reproducibility and color temperature, the emission spectrum of the backlight should be changed, and the transmission spectrum of the color filter should be adjusted to maximize the emission efficiency.

If a white, blue, green, and red LEDs must be used at the same time, many application problems occur. In particular, when using blue, green, and red LEDs at the same time, it is difficult to apply them realistically because of a technical problem of gathering different colors coming out according to the position of each LED to make white.

Therefore, in order to realize white light, it is required that all three wavelengths of one LED emit light with a predetermined intensity or more.

As such, there is an urgent need to develop a backlight that can utilize the advantages of the backlight of a SMD (Surface Mounting Device) LED of a mobile phone, which is not only small and compact, but also has a small power consumption.

On the other hand, the configuration of a general backlight unit is as follows.

1 is a view for explaining the structure of a general backlight unit.

As shown in FIG. 1, the fluorescent lamp 1, the light guide plate 2, the diffusion material 3, the reflection plate 4, the diffusion plate 5, the prism sheet 6, and the like are constituted.

First, when the voltage is applied to the fluorescent lamp 1, residual electrons existing in the fluorescent lamp 1 move to the anode, and the moving residual electrons collide with argon (Ar) to excite argon to proliferate cations, The multiplying cations collide with the cathode to release secondary electrons.

When the discharged secondary electrons flow through the tube to initiate discharge, the flow of electrons by the discharge collides with, and ionizes, mercury vapor to emit ultraviolet rays and visible light, and the emitted ultraviolet rays excite the phosphor coated on the inner wall of the lamp to display visible light. It emits light and emits light.

Subsequently, the light guide plate 2 is a wave guide for injecting the light emitted from the fluorescent lamp 1 into the surface to emit a surface light source to the top, and has excellent light transmittance. PMMA (Poly Methyl Meth Acrylate) ) Resin is used.

Factors related to light incidence efficiency of the light guide plate 2 include light guide plate thickness versus lamp diameter, the distance between the light guide plate and the lamp, the shape of the lamp reflector, and the like. In general, the fluorescent lamp 1 is thicker than the center of the light guide plate 2. By inclining in the direction, light incidence efficiency is increased.

The light guide plate 2 of the backlight unit for an LCD includes a printing light guide plate, a V-cut light guide plate, and a scattering light guide plate.

Subsequently, the diffusion material 3 is composed of Si0 ₂ , particles, PMMA, solvent, and the like. At this time, the Si0 ₂ particles described above are used for light diffusion and have a porous particle structure. PMMA is also used to attach Si0 ₂ particles to the lower surface of the light guide plate 2.

The diffusion material 3 is applied to the lower surface of the light guide plate in a dot form, and the area of the dot is gradually increased in order to obtain a uniform surface light source on the light guide plate 2. That is, the area closer to the fluorescent lamp 1 has a smaller area ratio occupied by dots per unit area, and the far side from the fluorescent lamp 1 has a larger area ratio occupied by dots per unit area.

In this case, the shape of the dot may have various shapes. If the area ratio of the dots per unit area is the same, the same brightness effect may be obtained on the light guide plate regardless of the shape of the dot.

Subsequently, the reflector 4 is installed at the rear end of the light guide plate 2 so that the light emitted from the fluorescent lamp 1 is incident into the light guide plate 2.

The diffusion plate 5 is installed on the light guide plate 2 to which the dot pattern is applied to obtain uniform luminance according to a viewing angle. As the material of the diffusion plate 5, PET or PC (Poly) is used. Carbonate) resin is used, and the upper part of the diffusion plate 5 has a particle coating layer that serves as a diffusion.

Subsequently, the prism sheet 6 is to increase the front luminance of the light that is transmitted through the diffusion plate 5 and reflected. The prism sheet 6 allows only the light of a specific angle to pass therethrough and the light incident at the remaining angle. Total internal reflection occurs and returns back to the bottom of the prism sheet 6. As described above, the returning light is reflected by the reflecting plate 4 attached to the lower part of the light guide plate 2.

The backlight unit configured as described above is fixed to the mold frame, and the display unit disposed on the upper surface of the backlight unit is protected by the top chassis, and the top chassis and the mold frame are coupled to accommodate the backlight unit and the display unit therebetween.                         

Hereinafter, a backlight unit of a conventional liquid crystal display device will be described with reference to the accompanying drawings.

2 is a perspective view showing a backlight unit according to the prior art.

3 is a plan view illustrating a backlight unit according to another conventional technology, and FIGS. 4A and 4B are cross-sectional views illustrating a backlight unit cut along lines II ′ and II ′ of FIG. 3.

The backlight unit according to the prior art, shown in FIG. 2, shows the use of a rectangular optical waveguide plate 10 made of a material transparent to light, the waveguide plate 10 being coupled out of light. It consists of a light emitting surface 11 on the upper side, a lower side 12 located opposite the light emitting surface, and four sides 13 to 16. And a plurality of cylindrical holes 20 (shown schematically) for the light source enter the lower side of the waveguide plate 10 to extend in the direction of the light emitting surface 11 and the R, G, B LED lamps (not shown) are disposed below the holes 20, respectively. The holes 20 are preferably evenly distributed in the optical waveguide plate in a regular grating arrangement.

As described above, the backlight unit using the LED lamps of R, G, and B has an advantage that the color reproducibility is improved and no mercury is used. However, in order to emit a mixture of colors from the LED lamps of the R, G, and B lamps, Each hole 20 should have an upper side and a side wall facing the light emitting surface 11, the upper side should be coated with a first reflective layer, and the lower side of the hole 20 should be a second side. It should be coated with a reflective layer and the edge of the hole 20 facing the upper side should be surrounded by a third reflective layer. Further, there is a problem in that the structure of the optical waveguide plate 10 and the light of the LED lamp of each hole is configured to occur through the side wall surface.

Next, the backlight unit according to another conventional technique has a structure using an intermediate light guide plate in a direct type as shown in FIGS. 3, 4A, and 4B.

3, 4A, and 4B include a plurality of lamp array units 30 in which a plurality of LED lamps 31 are arranged in one direction, and the lamp array units to diffuse and transmit light to a liquid crystal panel. The light scattering means 34 disposed on the upper portion of the 30 and the light of the LED lamp 31 to be well mixed to match the color uniformity disposed between the LED lamp 31 and the light scattering means 34 The intermediate light guide plate 32, a plurality of reflectors 33 disposed below the intermediate light guide plate 32 so as to correspond to each of the LED lamps 31, and the LED lamps 31 are fixed to the intermediate light guide plate 32. It consists of a mechanism (40) for supporting the light scattering means (34).

As described above, the intermediate light guide plate 32 is provided to prevent the light of the LED lamp 31 from directly coming out of the liquid crystal panel.

However, the backlight unit configured as described above has a problem in that the light scattering means 34 and the intermediate light guide plate 32 sag toward the LED lamp 31 due to the heat and gravity generated by the plurality of LED lamps 31. In addition, due to such a problem, a difference occurs in the brightness of the sag portion and the sag portion in the direction of the LED lamp 31. In other words, a portion sagging toward the LED lamp 31 appears bright and the remaining portion darker than this causes a problem of deterioration in image quality.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a backlight unit of a liquid crystal display device suitable for effectively preventing the light scattering means and the intermediate light guide plate from sagging and consequently deteriorating image quality.

The backlight unit of the liquid crystal display device according to the present invention for achieving the above object comprises a plurality of lamp array unit in which a plurality of lamps are arranged in one direction; Light scattering means disposed above the lamp array; An intermediate light guide plate disposed between the lamp and the light scattering means; A plurality of reflectors disposed below the intermediate light guide plate so as to correspond to each of the lamps; A first supporter configured to support the intermediate light guide plate from below; And a second support coupled to the first support and configured to simultaneously support the light scattering means and the intermediate light guide plate.

The lamp array unit is characterized in that a plurality of R, G, B LED lamps are arranged in sequence.

The intermediate light guide plate is characterized in that a hole is formed in a portion where the first and second supports are fastened.

The second support is fastened to the first support through the hole (hole), the upper portion is characterized in that it is configured to support the light scattering means, the lower portion to support the intermediate light guide plate.

The second support is characterized in that the recess is formed in a predetermined depth on both lower sides so that the intermediate light guide plate is fitted.

The second support and the first support is characterized in that the fastening by a hook structure, interference fit method or screw coupling method.

When the second support and the first support are fastened by using the hook structure, the inside of the first support is empty, and a hook-shaped protrusion is formed below the second support. And, the hook of the lower side of the second support is characterized in that the fastening is caught on the upper inner surface of the first support.

When the second support and the first support are fastened using the hook structure, the first support is provided with a hook-shaped protrusion at an upper portion thereof, and the first support is provided inside the second support. Grooves are formed to fix the hook-shaped protrusions of the first support, and the hook-shaped protrusions of the first support enter the grooves of the second support.

When the second support and the first support are fastened by a screw coupling method, a threaded protrusion is formed on an upper portion of the first support, and a groove in which the screw can be fastened is provided inside the second support. Alternatively, a threaded protrusion may be formed in a lower direction of the second support, and the groove may be provided at the inside of the first support to fasten the thread.

The first and second supports may be made of a light reflective material.                     

The first and second supports may be made of polycarbonate (PC).

The first and second supports are characterized in that formed of white or transparent or translucent material.

Prior to describing the present invention, in the prior art shown in FIG. 3, a brief description will be made of the backlight unit having a support to prevent the intermediate light guide plate from sagging in the direction of the LED lamp due to the heat and gravity generated in the LED lamps. do.

FIG. 9 is a diagram illustrating a problem caused by deflection when the intermediate light guide plate is constituted by one support of a two-stage structure.

As shown in FIG. 9, in order to prevent the intermediate light guide plate 92 from sagging in the direction of the LED lamp 91 due to the heat and gravity generated in the LED lamps 91, the support 94 is stepped in the middle. It was formed in a two-stage structure in which the stages were formed. A patent having such a support 94 is filed in Korea on November 29, 2003, and the application number is 10-2003-85968.

However, the support 94 set forth in this patent can only prevent the intermediate light guide plate from sagging in the direction of the LED lamp 91 (downward direction), and the intermediate light guide plate 92 is directed from the light scattering means 95 direction (upward direction). There is a problem that can not prevent sagging.

The present invention is characterized in that the intermediate light guide plate is supported using two supports (first and second supports) so that the intermediate light guide plate does not sag not only in the direction of the LED lamp but also in the direction of light scattering means. will be.                     

Hereinafter, a backlight unit of a liquid crystal display according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

5 is a plan view illustrating a backlight unit according to an exemplary embodiment of the present invention, and FIGS. 6A and 6B are cross-sectional views illustrating a backlight unit cut along lines III-III ′ and IV-IV ′ of FIG. 5.

7 and 8 are cross-sectional views illustrating coupling structures of the first and second supports according to the exemplary embodiment of the present invention for preventing sagging of the intermediate light guide plate in the up and down directions.

The present invention relates to a LED backlight unit having a direct structure, and as shown in FIGS. 5, 6A, and 6B, a plurality of lamp array units 50 in which a plurality of LED lamps 51 are arranged in one direction, and In order to diffuse the light to the liquid crystal panel, the light scattering means 55 disposed on the upper part of the lamp array unit 50 and the light of the LED lamp 51 mix well to match the color uniformity. An intermediate light guide plate 52 disposed in between the 51 and the light scattering means 55, a plurality of reflectors 53 disposed below the intermediate light guide plate 52 so as to correspond to each of the LED lamps 51; A first support 54a configured to support the intermediate light guide plate 52 from below, and a second support configured to be engaged with the first support 54a to simultaneously support the intermediate light guide plate 52 and the light scattering means 55. 54b, the LED lamp 51 is fixed and the intermediate light guide plate 52 and Consists Enclosures 60 for supporting the scattering means (55).

The lamp array unit 50 is configured by sequentially arranging a plurality of LED lamps of R, G, and B.                     

The intermediate light guide plate 52 has a hole formed at a portion where the first and second supports 54a and 54b are to be fastened so that the first and second supports 54a and 54b can be fastened.

The light scattering means 55 is to prevent the shape of the LED lamp 51 from appearing on the display screen of the liquid crystal panel and to provide a light source having a uniform brightness distribution as a whole. A plurality of diffusion sheets, a diffusion plate, and the like are disposed between them.

As the first and second supports 54a and 54b actually stand up and use the liquid crystal display, the intermediate light guide plate 52 is not only in the direction of the LED lamp 51 due to the heat and gravity generated by the LED lamps 51, It is comprised so that the phenomenon which falls also in the direction (up direction) of the light-scattering means 55 is comprised.

Hereinafter, a configuration example of the first and second supports will be described in more detail.

As shown in FIG. 6B, the first support 54a corresponds to a hole formed in one region of the intermediate LGP 52 in order to prevent the intermediate LGP 52 from sagging in the direction of the LED lamp 51. It is provided under the area | region which becomes.

In addition, the second support 54b penetrates the hole and is engaged with the first support 54a. The second support 54b is configured to support the light scattering means 55 at the upper portion and to support the intermediate light guide plate 52 at the lower portion. .

At this time, in order to prevent the intermediate light guide plate 52 from sagging in the direction of the light scattering means 55, the second support 54b has recesses formed at a predetermined depth on both lower sides thereof.

The intermediate light guide plate 52 is fitted into the recesses on both side surfaces of the lower portion of the second support 54b to be fixed.

In the above, the second support 54b and the first support 54a may be fastened by a hook structure, an interference fit method, or a screw coupling method.

First, in the case of using a hook structure, as shown in FIG. 7, the inside of the first support 54a is empty, and a hook-shaped protrusion is formed below the second support 54b. The protrusion below the second support 54b penetrates through the hole of the intermediate light guide plate 52, and is engaged by the hook portion on the upper inner surface of the first support 54a.

Next, another structure using a hook structure, as shown in Figure 8, the first support (54a) is provided with a hook-shaped protrusion on the top, the first support in the interior of the second support (54b). A groove is formed so that the hooked protrusion of 54a is fixed, and the hooked protrusion of the first support 54a enters into the groove of the second support 54b and is fastened.

At this time, 'd' indicates the thickness of the intermediate light guide plate 52, but the value of 'd' may be formed to be about 0 to 2 mm larger than the thickness of the intermediate light guide plate 52 in order to give some degree of fluidity against thermal deformation. .

Next, although not shown in the figure, the second support 54b and the first support 54a can be fastened by an interference fit method.                     

Next, when the second support 54b and the first support 54a are fastened by a screwing method, although not shown in the drawing, a threaded protrusion is formed on the upper part of the first support, and the second support ( 54b) may be provided with a groove to which the thread can be fastened. In other words, the threaded protrusion may protrude downwardly from the second support, and a groove to which the thread may be fastened may be provided inside the first support.

 The first and second supports 54a and 54b are made of a material having light reflection properties (for example, polycarbonate (PC)), and the color is formed of white or transparent or translucent material.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention is not limited to the contents described in the above embodiments, but may be modified within the scope obvious to those skilled in the art.

The backlight unit of the liquid crystal display device according to the present invention as described above has the following effects.

By providing the first and second supporters to simultaneously support the light scattering means and the intermediate light guide plate, it is possible to prevent the intermediate light guide plate from sagging in the vertical direction due to the heat and gravity generated by the LED lamp. Defective problems can also be prevented.

Claims (10)

A plurality of lamp array units in which a plurality of lamps are arranged in one direction; Light scattering means disposed above the lamp array; An intermediate light guide plate disposed between the lamp and the light scattering means; A plurality of reflectors disposed below the intermediate light guide plate so as to correspond to each of the lamps; A first supporter configured to support the intermediate light guide plate from below; And a second support coupled to the first support to simultaneously support the light scattering means and the intermediate light guide plate. The method of claim 1, The lamp array unit is a backlight unit of the liquid crystal display device characterized in that a plurality of R, G, B LED lamps are arranged in sequence. The method of claim 1, The intermediate light guide plate has a hole formed in a portion at which the first and second supports are fastened. The method of claim 3, wherein The second support is connected to the first support through the hole (hole), the upper support the light scattering means, the lower support the intermediate light guide plate, the intermediate light guide plate is inserted into and fixed to both sides of the lower A backlight unit of a liquid crystal display device, characterized in that the recess is formed to a predetermined depth. The method of claim 1, And the second support and the first support are fastened by any one of a hook structure, an interference fitting method, and a screw coupling method. The method of claim 5, When the second support and the first support are fastened by using the hook structure, the inside of the first support is empty, and a hook-shaped protrusion is formed below the second support. And a hook below the second support is caught by an upper inner surface of the first support. The method of claim 5, When the second support and the first support are fastened using the hook structure, the first support is provided with a hook-shaped protrusion at an upper portion thereof, and the first support is provided inside the second support. And a groove is formed to fix the hook-shaped protrusion of the first support, and the hook-shaped protrusion of the first support is inserted into the groove of the second support to be fastened. The method of claim 5, When the second support and the first support are fastened by a screw coupling method, a threaded protrusion is formed on an upper portion of the first support, and a groove in which the screw can be fastened is provided inside the second support. Or a threaded protrusion is formed in a lower direction of the second support, and a groove in which the thread is fastened is provided in the first support. The method of claim 1, And the first and second supports are made of polycarbonate (PC), which is a light reflecting material. The method of claim 1, And the first and second supports are formed of white, transparent, or translucent material.

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